/Engine/Source/Runtime/Engine/Classes/Materials/MaterialInterface.h
Re-caches uniform expressions for this material interface Set bRecreateUniformBuffer to true if uniform buffer layout will change (e.g.FMaterialis being recompiled). In that case calling needs to useFMaterialUpdateContextto recreate the rendering state of primitives using this material.
virtual void RecacheUniformExpressions ( bool bRecreateUniformBuffer ) const